Solar cell



FIG. 1 is a top perspective view of a solar cell showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right side elevation view thereof, the left side elevation view being a mirror image of FIG. 5; and,

FIG. 6 is a bottom plan view thereof. 

CLAIM The ornamental design for a solar cell, as shown and described. 